Rework tool_config_paths to allow multiple tool files via comma separated list.
Rework tool_config_paths to allow multiple tool files via comma separated list.

ssorgatem/pulsar,jmchilton/pulsar,natefoo/pulsar,jmchilton/lwr,galaxyproject/pulsar,jmchilton/lwr,galaxyproject/pulsar,natefoo/pulsar,ssorgatem/pulsar,jmchilton/pulsar